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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7694867ae6fca0a334a47e0a39064d8e49b5d76efb83647f93eb42b4f48179f' 
  AND token = 'bSNKovThRVzA4XkSENqgYzB9us3mJ5i4CWtVd7CNZ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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