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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524d0a149d21473586588e4ccd8655fba1ff5743b7be06e86bbad3487c107ce8' 
  AND token = '/nJnYu2Mhni/6HP1N9+9mLvYPFO+6hCs9MNXd0lY8fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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