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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4420f5e475efc1590e63698ad595b3a285bb9123390b9817ce0218f24e6944eb' 
  AND token = '1j14h5sfFHzuYCsDwhWdPIoNzb+8GYf0its7abcPv1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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