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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5227ee9e560bf8bb83a2298caf045a414d1109e21ffd831df22f886b6f2d28' 
  AND token = 'bROv6MFUYQTunly3HrgnBnSh2Wtqfc4bRF1fV/Ye6zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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