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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ad2fab5333558afa0690004de0a60de28a33dd7e9684de0f176dd7862ed332' 
  AND token = 'bSQMHoJWV0req9HpTXPjBAxiqDASCKBJKh8NwNE8la4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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