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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba62d068772b493fdac408fa32d066312ee0618e19b678da6cef8bd0b03527c' 
  AND token = 'T31kr4+d/7QIPVxs0je6CUtZZBForP//0lGXe23QKjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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