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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5407363a74214c36a7c9c9f9f235d20f39d9b16764029aeb1c315aa14f3974a3' 
  AND token = '1/8IHAu8TPLZdHXvfOowteOslnkiHzNB/fH1ULzYxI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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