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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e85ff034111d12132350a14a011324fd694d3ed9271c26f96f4029adaf87d03' 
  AND token = 'QKkC8bPxlE9Iv6lhb9gntmoYcr76OC1PGMzSNrG1a/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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