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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74110eae4a93c198f00b9b795ecc31672e5ce200709c95b3e844d67cabd6a5b4' 
  AND token = 'hj+3U/7r0QHR+ZvhcLTyipzfg5LOBMcmf0Pjh+gy7Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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