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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e372f1affe2578a84c68302264fa44f4feb63ae287ae54e2802596c6a4e00a9' 
  AND token = 'YFmRpDeG/9OT9K92tLWG5/hLMhPytsRM16XyDnGHGm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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