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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fa243f84735376ab8a451450783e6da29edea0c1ec1288e5b6108b0c03c731' 
  AND token = 'Y9e85IeTZZ/tNZnhLsvlCKienbdGbsOnF7ZaJbPTS8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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