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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1896130ecde6c3103e96a276e417f7d06215ae28e82d6d087603d379b3f6d904' 
  AND token = '/cXtx6olIsXwpjdAejI4TKSAZhdh1wZEtccA2BWJEDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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