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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ba0074101a34afc4b47a362a9d36edd3b50a00a645461e897daa7c2d088bd8' 
  AND token = 'VeYPUkVIMB7rG00I7EX+ebyvF7yaifueyWZxzQL2dZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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