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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56de3a00d402d0d5b634120c3322b4b9594413652e4ec45b2f1cc5cb5dba7012' 
  AND token = '3lz/b9UMa983W1/8/U8ml9v6laBlfsuYMWjw2KKsk6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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