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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3e3f1edd2c3a744e2360e353ade4a3a34f29baa9084ca336d553c65e15ff02' 
  AND token = '6gdAKmqYqZSN+xjzfIif76umHmTW27f0MYov9FA/TIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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