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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5ba6e4c69fcd5148e5aad0dc95d1fdfc4e87bf3b3afad19c27bfe0f81cecfa' 
  AND token = 'T7B6kRepNea8155G/CYYQwdJa9aPSS4fDn1vhXbRjsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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