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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614aae2e56cd53ce2ef110de8e97f7c40b595fb856e6895e33fa67f4ab487bea' 
  AND token = 'Ar1AnuiMM6G7toif3i1SvcMTI99p1Yt8Wabj2+Yv7S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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