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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4358ae187a11da7e26edc3434a6a2f0f85e576c2cf7f59080209f7791209eb' 
  AND token = 'HhNVuCJEtVDWVN9fa6+t+4jesJT6mLDwovC8vM+h5S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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