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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1bcb3e680e6fe49425e9cc55e9ea5800e24385cc972b684616868081a7ef55' 
  AND token = 'yxhWffJK8Arm6nlIRJRXFHJDoEBEsTb43w9/9uhMmaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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