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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359fa1a4142d19919d7c4c6b6ed77b5302bb06e0574240be67e0dc9aab0dfa5b' 
  AND token = 'xIer5oAIUFHY6XczXXUvCTEnYZUODVid2cao2iK8BDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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