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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819e64f20c532bbfc577c5b776b0b9d68738b15fbb22452541e98cb6a2e9112f' 
  AND token = 'yZhfoolUzsrKURIKp2zYIsh8cwmDv1GpI7+peeTrKtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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