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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90b706d617b12983f4ac127d9ad117eee149b5ca1d2b675a52c1438aa7362cd' 
  AND token = 'fhS/Fp4BaIF+xMakw26QWA+6he5Pmy591U0a3SrsHI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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