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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384677c03e9e4fc67c36d563c93c55e56df99814d8028338fad5ad3ce4d62479' 
  AND token = '2dPYx7fXb6pGP1jtqDrzGLTHp9Qq3DzOUyL30SUeUe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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