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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a46f931eb67fd8d6a0927ece567a7ca905216073d130fa03bdeb714fcb9d37' 
  AND token = 't1lG3fi5JpEAn9lY9+BaXzPHVN0PCQwY9wmdYgmpzEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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