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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e6ad646c0617c0740bf12270dd1d4628b9e313c3d643c7c89d56ff5d94b221' 
  AND token = '1lmh99IgVxKr9Z0iqfOYvNNvHlm+HRYq00tv8wtSCC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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