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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cedf19cdae595639ecf0a1a909bf3f43279b087e191a82a98cb9d5111096897' 
  AND token = '3k4Q7Fo851ojQfFCooZvwK2aINuA22b9/rIB5LA9XZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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