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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92190b421773c21d7a5cd27a3f10ee51159dfed3a4d748e2cf31a1c2717059d8' 
  AND token = 'yNOV8Fb2JVr/QbboES2QY2eelEG5sMULvH5R5/FLdnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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