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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e233a2132825b6ab9ce47e086376031c6c13b2a586b3970697907e90265af1' 
  AND token = 'Od5SyQnon0fLVik1zckAvBUgIR8yjWBaCqL0fm50m8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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