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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83d9c7420a774bbbab70a051f2e61c986896bec7db9a181570d9b874ecf09c4' 
  AND token = 'XtC/+hW/yuyXWxGLV83cGGAniN2Wk6Ka+OP7o149F/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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