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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5d84a93447973a77c949659a4340432445828d372b56c2d243f39c96861b42' 
  AND token = '1y2kvxVJQrMHHsdha/KWl1AqrxVVnMyzwtQJX/sv6Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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