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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb6d2fde41c19bbc84cf4410668652b65098aa936b4068cf7681a499de453e7' 
  AND token = 'AI+0exLpbY5gW69j2p5PqCjzRVa/RrEKx/6E5QyIFdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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