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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90112422289b80e3c33f47f2c47d0e1c9a65aa52f404116e0eb2c16a14aaf3d9' 
  AND token = 'T7i2xDxQeCIBKsH2C2svDuVprJ/y8GKB02q0AFCuJio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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