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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662516e5ba8ac0617293a8ea817876f874a74f9f3c9b4113457f29b0e48e1122' 
  AND token = '3PBtobbaRm5j1t/D7CUCsdJ/ZyO5BrJHghBz8PI8tP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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