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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c2067d7e1f64ccad51af1a8e9a0c36a0104b7804d3c4c4e78f04e3eba61731' 
  AND token = 'XSy1GXYnWpiOmzsH9Ns97OcANI6TYfJ2FiAkD/sPP+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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