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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acd3561a022c66c5268704152472055eeb9b6c57a8ae3737f92d56286dd323e' 
  AND token = 'iDW8OZ7vJd77OjWYWsffpsNqvmn72xb5ryLt0pk/15o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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