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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f314d2b8344737de75eccb26a791a988222a1fe7bf4720e8d049a4050928cbe3' 
  AND token = '+ppHjr28qxBQxacZL4c308ArKu3SaXmrO8gVmte9oKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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