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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77153ebad987a54324119e38409d1e505aa70457391b483accec9aa0d52f2666' 
  AND token = '2T/LPtFzCG6Q7TTJvDF1cuTdgSgzKDUsuSuH514CNJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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