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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e717b6ca4d7eceab7ba8786ec0853ad3a45d9b56f182e4b0e0ac1157d62960d' 
  AND token = 'C/7PN7gOUGnG8KDcMml4S4anirsr255pIq2EGAhDAPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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