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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8067eea657ed60e71366a40e216d0019ca6406babb8f18d9f7aac58c656a6c0b' 
  AND token = 'BZw8VwSm6nLPIMHqMtsONe2jeunKBX5g+5GxsQM3yfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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