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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6756834c7a007747f49f22d3b7a5dc9b08e18f7d7c77b7e5b1bf9eebbdcca9' 
  AND token = 'KJvi/TAOYI/0Keb+isDM3MhT7j7YBbSB6NS+U6YT3JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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