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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f377c63997314fa03c966fae69cfb9f14f0732cf9960d2f2b9925a842cf5652f' 
  AND token = 'cFwZ8LmbfjnvGbcNYZL7o51G9PZEc7OwimYVRu+58PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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