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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf52b8d2cfd51e8793db0de86f1eb516b6e548c61e7d2159ae3d1a99fd4161de' 
  AND token = 'tAwFAKKn93sman30/yWxAhZygLmSFXv8O5TFV4lgyl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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