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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9974cf635c6e2f5cab26f6473701e575b52dccb5e73f5a7ad7dc767a0bab420' 
  AND token = '4ThbhFr5aMdY4fBKydN6ucDUm8eTtj6ompmaATwegas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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