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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1173ee85e356ea44fa195382fb5953ccb1982bd31f386ef6b5fc25de4f4e68c' 
  AND token = '82Wg7Dsw5rSKEF1UKXcNli/ekEPrX94kfSE/8CGZzVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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