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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb1ed5cc12aa7d5b30c8201f2661cce3e07f70c7bdbcd2ded46d192d212fc9e' 
  AND token = 'C1o3/Mx0xt68bzwvWywkonUCUm+r9OU5g5tgNvPSS7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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