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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3626671bf9c0aabe5831c1f52cd5a5a83e592ae91aab1925246c880f2db40d7' 
  AND token = 'MUl3xYzaBJLfD9cn2gamLu3aDf7oddEdQSh0YMVbeTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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