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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834df1dea3e1e2e765d43fe3d56497a33ef893009eaefbe50b9511c868132506' 
  AND token = '5dE2zSUduSt5Ao0LWuR0CTvKg56BiH/n5HGmv6mh3zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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