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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a46f52b992cf1a8bd793ecb52da69dc6adb377c0eb9e9e8d5f5e257597a1cde' 
  AND token = '5qemRpanT60WAcALsR6P0Ry/4ZxyaVU7CwC7+W8U9ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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