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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2768266c3b5c40cf1bffe767fd31902d4d2b431adf3b015e3a0b48c869ddb2' 
  AND token = '0YBh4pzym1IY+niyjfl10+VLv5lcoMNeaRZaf5af9As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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