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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec72eda0b4c60906664488a605fc82650ea9a545f1e2efb2bff68e95e59ceef' 
  AND token = 'GPjM1koY8OF1yL0ual/QDfd9FreiiT/Kupt7ut4CEU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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