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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f9130cd35f7df45015ec83d395f3b76039ab67883d07c829d3adca1f2611a7' 
  AND token = 'yH+E4bFuexXhs+ObHOliCTszd4ZyvTG5xLO2WrO9w4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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