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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55915a3afd33aa5bef788ba4d60ab1ebdf807010a2521c1ebe7b60c7196524c9' 
  AND token = 'zOQED8+b5iOr2IUmpzKr9QZTQY399j2nBj3iRH0m++E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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