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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdd6887cb2f6e6ef18f622fd01acc4b678af877e0153dc4651560c76b5c9fc5' 
  AND token = '1xFyJxdcOM6bTqdQyk54LqT9wKTqBUTmKMISW3czh28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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