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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92717715693884183ef27d3a17a0e011c0f0fca36aff0a4b55f752c677e924a2' 
  AND token = 'ugsj9anshHjZlBfC557/Bo0+XfGjgTq7iaT0QLP9WtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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