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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c6fea4b38b9a7a628e5a2d962bf08478ce1e3c5476eb1414e7c6d644ba564c' 
  AND token = 'KH1drq1sRYK6+50UzJoAxkAA+8AI7nzDF4Okk+L5q2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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