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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb87d01bd9ba368a93a90454c8dd8dd37ee961fd14c17756c90b1c1c7aea380' 
  AND token = 'p7P67NrHlCLjjjaMEN5r6XMdyU/0l8Lh/KMNGQgIERc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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