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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba81b48c53111d19f298b72fe090da7b06d06029b581f0741501c478c45bf74' 
  AND token = 'z7yDq2WZxEhaGuyQgo9Itx7Gw6NTvRu1iFfValEMUNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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