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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3924fa0231cfd3acbaacfe244a157c6991aec6bcce2b9d7cb9f4ef4e2f47e501' 
  AND token = 'VH75RduobMsThBn0KNWt6qFang4lNr4XNq2E/cCjBfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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