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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961db43020ad8e63b2190e27847341b2312d8af95b2b082b23f1f697b4c2f623' 
  AND token = 'BmIVpKoDQle7bUsc8se7qN12NDDUoIZA2rtstZJRBXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}