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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec0cdb784368f4905fde676ca5ef03232a2a0b52d6ed9285338134ed0c81e00' 
  AND token = 'rht1zm3BekaZ70XjChvE0L9O7ZaMUhkSO8xyOoVGvYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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